{
  "cveId": "CVE-2026-64263",
  "url": "https://patchblox.com/security/cve/CVE-2026-64263",
  "summary": "CVE-2026-64263 is fixed in 20 products on 1 platform, first by ALAS2023-2026-2045, released August 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  fuse-uring: fix moving cancelled entry to ent_in...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  fuse-uring: fix moving cancelled entry to ent_in_userspace list  fuse_uring_cancel() moves entries that are available (these have no reqs attached) to the ent_in_userspace list. ent_list_request_expired() checks the first entry on ent_in_userspace and dereferences ent-\u003Efuse_req unconditionally, which will crash on a cancelled entry that was moved to this list.  Fix this by freeing the entry and dropping queue_refs directly in fuse_uring_cancel(). This is safe because cancel is the cancel handler itself - after io_uring_cmd_done(), no more cancels will be dispatched for this command, and teardown serializes with cancel via queue-\u003Elock.  Since cancel now decrements queue_refs, fuse_uring_abort() must no longer gate fuse_uring_abort_end_requests() on queue_refs \u003E 0, as cancelled entries may have already dropped queue_refs while requests are still queued. Remove the gate so abort always flushes requests and stops queues.",
  "published": "2026-07-25T10:17:06Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.0016,
  "epssPercentile": 0.05211,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bpftool6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-livepatch-6.18.39-79.141",
      "release": "amzn 2023",
      "fixedVersion": "1:1.0-0.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo-common-aarch64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo-common-x86_64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-headers",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-modules-extra",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-modules-extra-common",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.1.4-1",
      "fix": "DEBIAN-CVE-2026-64263",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-64263",
      "released": "2026-08-07T15:22:10Z"
    },
    {
      "platform": "linux",
      "product": "microvm-kernel6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "perf6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.39-79.141.amzn2023",
      "fix": "ALAS2023-2026-2045",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2045",
      "released": "2026-08-03T09:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}